Expansion of (1+x^4*C)*C^2, where C = (1-(1-4*x)^(1/2))/(2*x) is g.f. for Catalan numbers, A000108.

A071743

Expansion of (1+x^4*C)*C^2, where C = (1-(1-4*x)^(1/2))/(2*x) is g.f. for Catalan numbers, A000108.

Terms

    a(0) =1a(1) =2a(2) =5a(3) =14a(4) =43a(5) =135a(6) =438a(7) =1458a(8) =4952a(9) =17093a(10) =59787a(11) =211444a(12) =754834a(13) =2716430a(14) =9844071a(15) =35892558a(16) =131576330a(17) =484659105a(18) =1792926015a(19) =6658407540a(20) =24814260930a(21) =92772188130a(22) =347856470880

External references